Discord: Add users via accounts tab

Doesn't require a PIN like Telegram, as we can access a list of guild
users with the GuildMembers intent set. This has to be enabled under
Bot > Priviliged Gateway intents on the developer portal.

router.go

@@ -165,10 +165,12 @@ func (app *appContext) loadRoutes(router *gin.Engine) {
 			api.GET(p+"/telegram/pin", app.TelegramGetPin)
 			api.GET(p+"/telegram/verified/:pin", app.TelegramVerified)
 			api.POST(p+"/users/telegram", app.TelegramAddUser)
-		}
-		if discordEnabled || telegramEnabled {
 			api.POST(p+"/users/contact", app.SetContactMethods)
 		}
+		if discordEnabled {
+			api.GET(p+"/users/discord/:username", app.DiscordGetUsers)
+			api.POST(p+"/users/discord", app.DiscordConnect)
+		}
 		if app.config.Section("ombi").Key("enabled").MustBool(false) {
 			api.GET(p+"/ombi/users", app.OmbiUsers)
 			api.POST(p+"/ombi/defaults", app.SetOmbiDefaults)